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如图，小正方形的边长均为1，则∠1的正切值为（ ）
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如图正方形网格中每个小正方形的边长均为1每个小正方形的顶点叫格点以格点为顶点按下列要求画图1在图中
如图边长为1的小正方形构成的网格中半径为1的⊙O在格点上则∠AED的正切值为.
如图边长为6的大正方形中有两个小正方形若两个小正方形的面积分别为S.1S.2则S.1+S2的值为
16
17
18
19
如图每个小正方形的边长为1ABC是小正方形的顶点则∠ABC的正切值为．
如图在边长为1的小正方形构成的网格中半径为1的⊙O.的圆心O.在格点上则∠AED的正切值等于____
问题现有5个边长为1的正方形排列形式如图①请把它们分割后拼接成一个新的正方形.要求画出分割线并在正方
如图正方形网格中每个小正方形的边长均为1每个小正方形的顶点叫格点.1在图①中以格点为端点画线段MN=
在每个小正方形的边长为1的网格图形中每个小正方形的顶点称为格点.以顶点都是格点的正方形ABCD的边为
在同一平面内如果两个多边形含内部有除边界以外的公共点则称两多边形有公共部分.如图若正方形ABCD由9
4
5
6
7
如图每个小正方形的边长为1A.B.C.是小正方形的顶点则cos∠ABC为.
如图每个小正方形的边长都为1点ABC都在小正方形的顶点上则∠ABC的正切值为．
如图边长为6的大正方形中有两个小正方形若两个小正方形的面积分别为S1S2则S1＋S2的值为
16
17
18
19
如图所示边长为1的小正方形构成的网格中半径为1的⊙O.的圆心O.在格点上则∠AED的正切值等于.
现有10个边长为1的正方形排列形式如图1请把它们分割后拼接成一个新的正方形.要求在图1中用实线画出分
阅读下列材料小华遇到这样一个问题已知如图1在△ABC中AB=AC=BC=2三边的长分别为求∠A.的正
如图边长为1的小正方形构成的网格中半径为1的的圆心O.在格点上则∠AED的正切值等于________
在同一平面内如果两个多边形含内部有除边界以外的公共点则称两多边形有公共部分.如图若正方形ABCD由9
4
5
6
7
如图所示在4×4的正方形网格中的每个小正方形边长都是1画出两个边长为无理数的两个正方形且使它的每个顶
如图在网格中小正方形的边长均为1点
，
，
都在格点上，则∠ABC的正切值是（ ） A. 2B.
C.
如图所示边长为1的小正方形构成的网格中半径为1的⊙O.的圆心O.在格点上则∠AED的正切值等于.
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假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文. 文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加:在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除:把多余的词用斜线\划掉. 修改:在错的词下划一横线并在该词下面写出修改后的词. 注意:1.每处错误及其修改均仅限一词; 2.只允许修改10处多者从第11处起不计分. TheoldsayingTheearlybirdcatchesthewormshowustheimportanceofplanningworkinghardandtryingconstant.Toachieveoutstandingresultsmostpeoplemustplanaheadandworkdiligentlytoovercomeallkindofdifficulties. Thathasbeenmyownexperienceeither.WhenIfirststartedhighschoolIseldompassedrayexamssoIneverpreparedwell.LatermyteacherMr.Blackadvisedmeplaneverythingintheadvance.Sheaskedmetostudyhardaswell.AfterayearofputtinghisadviceontopracticeIcannoweasilypassallmyexams.Therearenoshortcutstosucceed.
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.作文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加:在缺词处加一个漏字符号Λ并在其下面写出该加的词. 删除:把多余的词用斜线\划掉. 修改:在错的词下划一横线并在该词下面写出修改后的词. 注意:1.每处错误及其修改均仅限一词; 2.只允许修改10处多者从第11处起不计分. Thisismyfifthdayatthesummercamp.Lifeisn'texactwhatIexpected.WehavetogetupearlytomakeourbedsbeforeourteacherMissLicometoinspect.Afterbreakfastwehavesomeoffreetime.YesterdaymorningIwentfishingbuttheonlythingIcatchwasatreebranch.Intheafternoontherearedifferentactivitylikehorsebackridingandhiking.They'refunsonothingnewforme.Intheeveningeveryoneisassignedadifferenttasktogetdinnerready.YesterdayIwasinchargeofpreparethehotdogsbutIaccidentallydroppeditinthefire.Thebestpartofcampisatnightwherewesitaroundacampfireandtellstories.
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化学就在我们身边．现有①石墨②氯化钠③稀硫酸等几种物质．选择适当的物质填空填序号 1可用于金属表面除锈的是 2可用于配制生理盐水的是 3可作干电池电极的是．
Joyce:Whatdoyouthinkoftheleadteacher'sspeech? Caroline:Ithinkitwas1interest. Joyce:2doI.IhearMikeislikelytowinalltheprizesintheexamsthisyear. Caroline:Yeshisteachersaysso.He3workhardathislessonseveryeveningformonths.HewanttogotoOxfordUniversitynextyear. Joyce:Ihopehewillrealizehisgoal. Caroline:Ihopeso.4Ithinkheworkstoohard.Ihopehe'llgooutandenjoy5forachange.HowaboutyoursonCarl? Joyce:Don'tmentionhim.Carlneverstartsstudying. Caroline:You'rejoking.IheardthatCarl6winthecompositionprize. Joyce:Youhavemade7mistake.ThatisWhiteCarl.MysonisBrownCarl.Thewhitesliveinthesamecommunity8wedo.WhiteCarlhasalwaysbeensohardworking.Hewantstobea9write.Mysonlikesgoingtotheconcert.Heonlylikessinging. Caroline:10hepracticessinginghewillbecomeasingerinthefuture. Joyce:Notallpeoplecanbecomeasinger.Idon'tthinkhehasthetalent.
A﹣G是初中常见的物质其中E为黑色固体．如图为这些物质的转化关系其中部分生成物和反应条件已省略． 1写出下列物质的化学式C． 2B→D转化过程的基本反应类型是． 3写出E→G的化学方程式．
MoneyspentonadvertisingismoneyspentaswellasanyIknowof.Itservesdirectlytoassistarapiddistributionofgoodsatreasonablepricestherebyestablishingafirmhomemarketandsomakingitpossibletoprovideforexportatcompetitiveprices.Bydrawingattentiontonewideasithelpsenormouslytoraisestandardsofliving.Byhelpingtoincreasedemanditensuresanincreasedneedforlabourandisthereforeaneffectivewaytofightunemployment.Itlowersthecostsofmanyservices:withoutadvertisementsyourdailynewspaperwouldcostfourtimesasmuchthepriceofyourtelevisionlicensewouldneedtobedoubledandtravelbybusortubewouldcost20percentmore. Andperhapsmostimportantofalladvertisingprovidesaguaranteeofreasonablevalueintheproductsandservicesyoubuy.Apartfromthefactthattwenty﹣sevenActsofParliamentgovernthetermsofadvertisingnoregularadvertiserdarepromoteaproductthatfailstoliveuptothepromiseofhisadvertisements.Hemightfoolsomepeopleforalittlewhilethroughmisleadingadvertising.Hewillnotdosoforlongformercifullythepublichasthegoodsensenottobuytheinferiorarticlemorethanonce.IfyouseeanarticleconsistentlyadvertiseditisthesurestproofIknowthatthearticledoeswhatisclaimedforitandthatitrepresentsgoodvalue. AdvertisingdoesmoreforthematerialbenefitofthecommunitythananyotherforceIcanthinkof. ThereisonemorepointIfeelIoughttotouchon.RecentlyIheardawell﹣knowntelevisionpersonalitydeclarethathewasagainstadvertisingbecauseitpersuadesratherthaninforms.Hewasdrawingexcessivelyfinedistinctions.Ofcourseadvertisingseekstopersuade. Ifitsmessagewereconfinedmerelytoinformation﹣andthatinitselfwouldbedifficultifnotimpossibletoachieveforevenadetailsuchasthechoiceofthecolourofashirtissubtlypersuasive﹣advertisingwouldbesoboringthatnoonewouldpayanyattention.Butperhapsthatiswhatthewell﹣knowntelevisionpersonalitywants. 1Bythefirstsentenceofthetexttheauthormeansthat. A.heisfairlyfamiliarwiththecostofadvertising B.everybodyknowswellthatadvertisingismoneyconsuming C.advertisingcostsmoneylikeeverythingelse D.itisworthwhiletospendmoneyonadvertising 2InthetextwhichofthefollowingisNOTincludedintheadvantagesofadvertising? A.Securinggreaterfame. B.Providingmorejobs. C.Enhancinglivingstandards. D.Reducingnewspapercost. 3Theauthorthinksthatthewell﹣knownTVpersonalityis. A.verypreciseinpassinghisjudgementonadvertising B.interestedinnothingbutthebuyers'attention C.correctintellingthedifferencebetweenpersuasionandinformation D.obviouslypartialinhisviewsonadvertising 4Intheauthor'sopinion. A.advertisingcanseldombringmaterialbenefittomanbyprovidinginformation B.advertisinginformspeopleofnewideasratherthanwinsthemover C.thereisnothingwrongwithadvertisinginpersuadingthebuyer D.thebuyerisnotinterestedingettinginformationfromanadvertisement
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某同学为探究镁锌铜银的活动性顺序设计如下图所示试验依据实验流程设计下面对物质①②的选择合理的是
Itwasourschool'syearlydancingshow.I1beexcitedthatIwaschosenbytheteacherthistimealthoughIdidn'thaveanyexperienceofdancingforashow.Iwoulddanceinfrontofallthestudentsand2teacher.Itmademeveryproud. HoweverIwasabitsad3myfatherhadnotimetowatchmedance.He4invitetohaveabusinessmeeting.Iknewthatmyfatherwouldsurelycometomyshowifhecould.5luckymymotherandmyeldersisterwerestillcomingtowatchmyshow. 6thebeginningofthedayIwasverynervous.AfterchangingintothedressandgettingmymakeupdoneIfelt7relax.ThenIwentontothestagebravely.Iwasverygladtoseemymotherandsistersittingin8secondrow. JustbeforethelightsturneddarkIsawmyfatherrushintothehallandtaketheseatbesidemymother.9apleasantsurpriseitwas!Thesightofmyfathermade10Ismile.Ibegandancingconfidently.Soonaftertheshowmyfamilycamebackstagetocongratulateme.Iwassohappyandluckytohavemyfamily'ssupport.
生活中困难不可避免面对各种困难需要信心.假如你是李华尝试举例说明信心在学习考试生活等方面的作用并就面对困难的态度谈谈你的看法. 注意:1可适当增加细节以使行文连贯; 2词数100左右. .
某碳酸钠样品含有少量的氯化钠取12g该样品加入60g水中使其完全溶解再加入63.4g稀盐酸恰好完全反应共产生气体4.4g． 1样品中碳酸钠的质量分数计算结果精确到0.1% 2反应后所得溶液中溶质的质量分数是多少
Jealousofthekidsatschoolwhoaresmarterthanyouandseemtolearnmorequickly?Don'tworry.1 2HoweveraccordingtoarecentstudyIQcanrise﹣﹣notjustbyoneortwopointsbutbyasmanyas21points! ScientistshavefoundthatIQchangesarelinkedtochangesinpartofthebraincalledgraymatterwhichwasseentogrowandbecomedenserinthebrainsofpeoplewhoseIQsimprovedgreatly.3Oneistotrainyourshort﹣termmemory.Previousresearchhasproventhatshort﹣termmemoryisthebasisforintelligencesotryingtorecognizeorretellsomethingthatyouhaveseenorheardcanhelpraiseyouroverallbrainpower.4 Agoodnight'ssleepwillalsohelpimproveyourconcentration.5Ithelpsyoustayfocusedforlongerthenextday. Scientistshavealsofoundthatexercisehelps.Walking30minutesadayfivetimesaweekanddoingexercisewillhelpyoubecomemoreknowledgeableaswellashealthierandfitter. A.Thereareseveralwaysofincreasingyourbrain'sgraymatter. B.Yourbraindealsmoreefficientlywiththingsyoutrulylike. C.Withabitofbraintrainingthechancesarethatyoucanbeassmartastheyare. D.Somaybeit'sagoodideatogetyourbrainintrainingrightaway. E.Gettingenoughsleepislikepushingtheresetbuttoninyourbrain. F.Themoreyouworkonitthebetteryouwillbecome. G.Peopleusedtoassumethataperson'sIQwasunchangeable.
ThebiggestturningpointinmylifesofarwasthedayIlefthometogotocollege.BytheageofeighteenIhadneverbeenawayfrommyparentsformorethantwoweeks.1 WhenthedaytopackmythingscameIbegantowonderifIhadmadetherightdecision.ItriedtopersuademyselfwiththethoughtthatIwasmovingontoabetterlifebuttherewasstilladoubtinthebackofmymind.DeepinmythoughtswasthatIwasleavingallmyfriendsbehind.2 3IwassadlonelyandmoreterrifiedthanIhadeverbeeninmylife.HoweveronceIhadbeenshowntomyroomandhadmetsomeoftheotherstudentsIbegantofeelalotmorepositive.WithinafewdaysIwasmorecomfortableinmynewsurroundingsandallmydoubtsandfearsdisappeared.ThereweresomanynewthingstoexperienceandpeopletomeetthatIdidnothavetimetobeupset. Oneofthemainreasonswhythiswassuchanimportantchangeformewasthatmylifewastakingacompletelynewdirection.4HoweverIsoonrealizedthatIcouldmanagethemwell. 5Perhapsoneofthelessonsweshouldlearnishowtoturnthosethatarenewtoustoourbestadvantage. A.Peoplehavetomoveonandtherearealwayschangesinourlives. B.AnditwaswithsadnessthatImademywaytothetrainstation. C.SoIviewedmynewindependencewithamixtureofworryandexcitement. D.BythetimeIarrivedatmydestinationIbelievedIhadmadeaterriblemistake. E.IfeltincontrolforthefirsttimeandIwasdoingwhatIwanted. F.Thereweresomeproblemsoflookingaftermyselfsuchaswashingclothesbuyingfoodetc. G.I'dbeenonholidaywithsomefriendssoIcannotsayI'dhadthechancetogettooworriedaboutthemove.
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Whenadoglosesalegtheanimaleventuallyfiguresoutthebestwaytogetaroundonthreelegs.Inashorttimethedoglearnstodealwithitsphysicaldisability.Nowscientistshavedevelopedrobotsthatbehaveinmuchthesameway. Wecanfindrobotseverywhere.Robotsbuildcarsplaychessandcancleanyourhouse.Theymaysomedaydriveyourcartoo.TworobotsnamedSpiritandOpportunityweresenttoMarsonamissiontoexploretheredplanet.JeffCluneisacomputerscientistfromtheUniversityofWyoming.Hesaysrobotsalsohelppeopleinnaturaldisasters.Robotsareusedinsearchandrescueoperationsfollowinganearthquake.Theymaysomedayalsobeusedtoexaminethewreckage残骸ofanuclearaccidentliketheoneinFukushimaJapan.Mr.Clunesaysrobotscanbesenttoalotofplacessaidtobeunsafe.Theproblemisthatallofthosetypesofsituationsandenvironmentareextremelyunpredictable.Anditisverylikelythatrobotsandhumansinthosesituationsbecomedamaged.Heandotherscientistsaredevelopingtechnologysothatrobotswillcontinueoperatingafterthefirstsignofinjury.Theywantthemachinestohavetheabilitytomakechangesandcontinueperforminguntiltheycanberepaired. Mr.CluneandresearchersinFrancehaveaddedonemoreoperationtotheskillsetofrobotsworkingunderdifficultconditions.Theysaytheyprogrammedarobotonewithsixlegsandaroboticarmtolearnhowtodealwithinjury.TheirfindingswerereportedinthejournalNature.Mr.Clunesaidthatoncetherobotsbecomedamagedtheyusetheirintuition直觉andknowledgeofhowtheirbodyworkstofindawaytodealwiththedamage.Hesaystherobotsarealsoprogrammedwithchild﹣likecuriosity.Inotherwordstheyarealwaysaskingquestionsandlookingforanswers.Thewholeprocesstakesaboutaminutefortherobotstofindawaytoovercomedamage. 1Atthebeginningofthepassagethewritermentionsdogsto. A.introducethetopicinamoreattractiveway B.provideexamplesofhowanimalsdealwithunexpectedinjury C.provehowscientistsgetinspirationfromdogstodeveloptechnology D.showtherelationshipbetweendogsandrobots 2AccordingtothepassagenowadaysrobotsCANNOT. A.helppeopleinsearchandrescueoperationsfollowinganearthquake B.besentonamissiontoexploreontheMars C.examinethewreckageofanuclearaccident D.buildcarsorcleanthehouse 3WhyareMr.Cluneandotherscientistsdevotedtodevelopingthetechnology? A.Theyexpecttoenablerobotstocontinueworkingdespiteinjuryunderdifficultconditions. B.Theywanttosucceedinprogrammingrobotwithchildlikecuriosity. C.TheyaredeterminedtodesignamorepowerfulrobotforMarsexploration. D.Theyintendtomakerobotswhichcanbesenttoalotofplacessaidtobeunsafe. 4Nowscientistshavedevelopedrobotsthatoncedamagedcan. A.continueperforminginspiteofthedamage B.relyontheirfunctionstofigureoutawaytohandlethedamage C.spendaboutanhourfindingawaytoovercomedamage D.maintaintheirchildlikecuriosityandkeepaskingpeoplearoundforsolutions
Iloveagoodmurdermystery.Itisso1towatchorreadanexcitingandinterestingdetectivestoryandtrytosolvethe2yourself.AgathaChristieisundoubtedlyqueenofthedetectivestoryconsideringshe3overeightybooks.Manypeoplehavefalleninlovewithher4﹣﹣﹣﹣﹣HerculePoirotafamousBelgiandetectiveandMissMarpleanoldladywhoisalsoanamateur5. AsIamabig6ofAgathaChristieIwasexcitedto7herhouseinDevoncalledGreenway.Itravelledtoher8bysteamtrain.Wewentthroughadarktunnelandtherewaslotsofsmoke.Itwasa9settingforamurderlikeinherfamousnovelMurderontheOrientExpress.10allthepassengersarrivedsafely! AfterapleasantwalkthroughthewoodsI11thesplendidhouse.IdidatourandIlovedseeingwhereshewroteher12.Manyfirsteditionswereondisplayinarevolving旋转的bookcase.Howevermy13partoftheestate房产wastheboathouse.Therewasalovelyviewoftheriver14theboathousealsoservedamorespecialpurpose﹣﹣﹣inspirationforacrime15.InthePoirotnovelDeadMan'sFollyagirl'sbodyis16intheboathouse.Theyeven17theTVadaptationofthebookatGreenway. Ireally18myvisittoGreenway.Itwassucha19placeandIwasinterestedinseeingwhereAgathaChristiewas20towritesomanyexcitingstories. 1A.upset B.serious C.successful D.fun 2A.doubt B.problem C.murder D.method 3A.read B.wrote C.saw D.contributed 4A.creations B.inventions C.discussions D.reasons 5A.guard B.detective C.creator D.spy 6A.guide B.fellow C.fan D.gift 7A.watch B.rebuild C.explode D.visit 8A.house B.family C.hometown D.site 9A.perfect B.central C.colorful D.direct 10A.Sadly B.Fortunately C.Hopefully D.Surprisingly 11A.fetched B.got C.reached D.mentioned 12A.posts B.poems C.letters D.books 13A.personal B.useful C.rewarding D.favourite 14A.or B.and C.but D.for 15A.scenery B.sight C.view D.scene 16A.dissolved B.tended C.found D.buried 17A.developed B.filmed C.adapted D.affected 18A.enjoyed B.treasured C.exploited D.focused 19A.shocking B.beautiful C.skilful D.helpful 20A.inspired B.disappointed C.marked D.honored
1以下是四种常用的危险品标志油罐车上应贴的标志是填序号 2油罐车起火燃烧有三个必要条件其中汽油为可燃物还需要有氧气和． 3调查表明火灾伤人事故很多是由于缺乏自救常识造成的．当油罐车起火燃烧爆炸时下列自救措施不当的是填序号． A．迅速脱下衣物扑灭大火B．背对爆炸地点迅速卧倒C．用湿毛巾捂住口鼻选择合适通道迅速逃生．
假定你是李华你校英文报心理与健康栏目拟刊登一篇文章为高三备考的学生如何安排课余生活和释放心理压力提出建议.请你为此栏目写一篇英语短文要点如下: 1.高三学习的挑战和困难 2.如何安排课余生活 3.如何释放心理压力 注意:1.词数100左右; 2.可以适当增加细节以使行文连贯; 3.开头语已为你写好. LifeinSeniorThreeisnoteasy.
水是生命之源．下列有关水的说法正确的是
InthesmalltownsoftheUnitedStatesinthe1nineteencenturythegeneralstorewas2everyoneboughtthethingshecouldn'tmake3growathome.Whatthestoressold4tellagreatdealabout5lifeatthattime.Peopleboughttoolsthattheyneededforfarmwork;saltsugarand6foodsthatthefarmdidn'tproduce;articlesofclothingthattheycouldn'tmake7;shirtsforthemen;orclothesforthechildren.Lifewassimplethen.Onefeelsthatpeoplewere8thankforwhattheyhadandthattheylookedforwardwithcourageto9thefuturebrought.Itwouldbeinterestingtoknowhowtheywouldfeelaboutthelifetoday.Woulditseemtothemthatlifeistoocomplex?Wouldtheyenjoy10livealifeaswedonow?
MoviefansknowthattheiractionheroSupermandoesnotreallyfly.AndinthemovieSupermanReturnsanothervisualtrickisplayedonviewers.Themantheyseeflyingisnotreal.Heiswhatiscalledavirtualactor.Thefirststepincreatingthisdigitalactoristohavearealpersonstandinaroomcalledalightstage.Acomputerthencapturestheoutlinesandshapesofhisfaceandrecordshowtheythrowofflight.PaulDebeveciswiththeInstituteforCreativeTechnologiesattheUniversityofSouthernCalifornia. Wecanlightthemwithveryspeciallycomputer﹣controlledillumination照明andtakephotosofthemfromsevendifferentviewpointswithhighqualitydigitalstillcameras. Mr.Debevecispartofateamworkingtocreatecomputerizedimagesofpeopleobjectsandenvironmentsthatlookandactreal.ThelightstagepermitsactorstobeturnedintodigitalversionsofthemselvesmuchlikethebluecreaturesinthemovieAvatar.Therealworldcouldsoonbeusingasimilartechnology.ComputerexpertsattheInstitutearedevelopinga3﹣Dvideoteleconferencingsystem.Itwouldsendavideoimageofapersonintoameetingroom.Thatimagewouldbeabletoworkwiththepeopleintheroomwhowouldseeitin3﹣Dwithoutspecialeyeglasses.PaulDebevecsays: Thepersonwhoisbeingtransmittedtoaremotelocationcanactuallylookaroundatthepeopleintheroomandeverybodyinthatroomknowswhothey'relookingat.Andthat'ssuchafundamentalpartofhumancommunication. Hebelievesthebusinessworldwillbegintouse3﹣Dvideoteleconferencinginthenextfiveyears.It'salsoamediumwithwhichyoungpeopletodayareparticularlycomfortablehesaid.Ademonstrationofaninteractionbetweenanearthquakesurvivorandstudentsmaybepossibleinayear.In10yearswemaybeabletoplay3﹣Dvideogameswithoutspecialglasses. 1WhydoestheauthormentionthemoviesSupermanReturnsandAvatarinthepassage? A.Tocomparetheirdifferentstyles. B.Toexplain3﹣Dfilm﹣makingtechnology. C.Toattractmorereaderstowatch3﹣Dfilm. D.Todescribetheoriginof3﹣Dfilmindustry. 2Whichofthefollowingshowshowavirtualactorismade? a.arealactorstepsinsidealightstage. b.anactoriscreatedintodigitalversion. c.photosaretakenfromdifferentaspects. d.howtheactor'sfacereflectsthelightisrecorded. e.acomputermakessurehowtheactor'sfaceisfilmed. A.a→e→d→c→b B.a→c→e→d→b C.a→e→c→f→b D.e→d→c→a→b 3Whatistheauthor'sattitudetowards3Dtechnology? A.Cautious B.Positive C.Skeptical D.Critical 4What'sthemainideaofthetext? A.3﹣Dgoesfrommoviestorealworld. B.3﹣Dfilmbecomespopularworldwide. C.3﹣Dteleconferencingsystemcomesintobeing. D.3﹣Dgameswithoutspecialglassesbecomestrue.
Soyouwanttodrawmoneyfromabank?Doityourself.WanttofixtheInternetconnection?Doityourself.Needaboardingcardforyourflight?Doityourself.Intheorycompaniescansavemoneybyreplacinghumanworkerswithautomatedself﹣servicesystemswhilecustomersgainmorechoicesandgetquickerservice.Surelytheexpansionofself﹣serviceintomoreandmoreareasistobewelcomed? Notnecessarily.Whenitisdonewellself﹣servicecandogoodtobothcompaniesandcustomers.Butwhendonebadly﹣whohasnotfoundthemselvestrappedinaseriesofendlesstouch﹣tonemenus?Inareaswhereself﹣serviceisonlyjuststartedthisislessofaproblem:angrycustomerscanafterallalwaystaketheirbusinesselsewhere.Butifeverybankweretopreferself﹣servicesystemscustomerswouldnolongerbeabletoexpresstheirdiscountbyvotingwiththeirfeet.Asaresultsomebanksforexamplealreadypromisethattheirtelephone﹣bankingservicesalwaysofferthechoiceoftalkingtoahumanoperator.Butinreturnforhumanservicemanycompanieswillsimplychargemore. Anotherdisagreementtoself﹣serviceisthatwhileitsavescompaniesmoneyitdoesnotalwayssavetheircustomers'time.Inthebestcasesitdoesofcourse:checkingyourselfinattheairportcanbequickerthanqueuingormakingaphonecall.Butasmoreandmoretasksareontocustomerstheymaystarttohopeforthedaysofold﹣fashionedservice. Allofthissuggeststhattherearelimitstohowfarself﹣servicecanbetaken.Companiesthatgotoofardowntheself﹣servicerouteortodoitincorrectlyarelikelytofindthemselvesbeingpunished.Insteadabalancebetweenself﹣serviceandtraditionalformsofserviceisnecessary. 1Whatadvantagesdoestheself﹣servicetechnologycertainlybring? A.Cuttingthecostforthecompanies. B.Savingmoneyforcustomers. C.Offeringcustomersextramoney. D.Defeatingthetraditionalformsofservice. 2Whatdoesthewritermeanbysayingcustomerswouldnolongerbeabletoexpresstheirdiscountbyvotingwiththeirfeet? A.Customerswouldbesoangrythattheykickanddamagethemachineprovidingself﹣service. B.Customerswouldnotbeabletoexpresstheirangeratthebank'sservicebyleavingthere. C.Customerswouldtrytheirbesttopersuadethebanktostopself﹣service. D.Customerswouldelectsomeleaderstohaveatalkwiththebank. 3Fromthispassagewecanseethatthewritertheuseofself﹣service. A.dislikes B.supports C.thinkshighlyof D.makescarefuljudgmenton
ScientistsinArgentinahavecreatedtheworld'sfirstcowwithtwohumangenesthatwillenableittoproducehuman﹣likemilk. Geneticengineeringwasusedtointroducethemothers'milkgenesintotheanimalbeforebirthaccordingtotheNationalInstituteofAgribusinessTechnologyinBuenosAires. Asanadulttheclonedcowwillproducemilkthatissimilartohumansinwhatwillproveadevelopmentofgreatimportanceforthenutritionofinfantssaidtheinstitute.TheclonedcownamedRositaISAisthefirstintheworldthatincorporatestwohumangenesthatcontaintheproteinspresentinhumanmilksaidthestatement. TheArgentineteamsaidtheChineseonlyintroducedonehumangenewhiletheirresearchinvolvedtwomeaningthemilkwillmorecloselyresemblethatofhumans. Ourgoalwastoraisethenutritionvalueofcows'milkbyaddingtwohumangeneswhichdogoodtotheimmunesystemoftheinfants.saidAdrianMuttofromtheNationalUniversityofSanMartinwhichworkedwiththeinstitute. CristinaKirchnerPresidentofArgentinasaidthatthescientificinstitutemakesallArgentinesproud.Shealsorejectedthatshehadrejectedthehonourofhavingthecownamedafterher.TheycametotellmethatthenameisCristinabutwhatwomanwouldliketohaveacownamedafterher?ItappearedtometobemorepropertocallitRosita. 1WhydidthescientistsinArgentinaintroducetwohumangenesintotheclonedcow? A.BecausetheChineseengineersonlyintroducedonegeneintheirresearch. B.BecauseCristinaKirchnerPresidentofArgentinaexpectedthemtoincorporatetwogenes. C.Becausetwohumangenesenabledthecowtoproducemorenutritiousmilkfortheinfants. D.BecauseMuttofromtheNationalUniversityofSanMartinthoughttheycouldbethefirst toincorporatetwogenesinthecow. 2WhatcanbeinferredfromCristinaKirchner'sstatements? A.Shewasquitesatisfiedwiththeresearchdonebytheinstitute. B.Sheconsidereditanhonortonamethespecialcow. C.Shefeltitimpropertobenamedafterthecow. D.Sherefusedtogiveanametothecowoutofself﹣respect. 3WhichofthefollowingcanbestreplacetheunderlinedexpressioninParagraph4? A.havemorevarietiesthan B.bemoresimilarto C.havemorenutritionthan D.bemoredifferentfrom 4What'sthepassagemainlyabout? A.Theimportanceofgeneticengineering. B.Waystoimprovemother'smilk. C.Aclonedcowtoproducehuman﹣likemilk. D.AdvancedagriculturaltechnologyinArgentina.
下列实验操作中错误的是
TimeTravel Ifyoucouldtravelintimewherewouldyougo?PerhapsyouwouldwatchanoriginalperformanceofaShakespeare'splayinElizabethanEngland?WhatabouthangingoutwithLaoziintheSpringandAutumnPeriod?Ormaybeyou'dvoyagefaraheadofthepresentdaytoseewhatthefutureholds. Thepossibilityoftimetravelisindeedappealing.Storiesexploringthesubjecthavebeenaroundforhundredsofyears.PerhapsthebestknownexampleissciencefictionnovelTheTimeMachinewhichwaswrittenbyH.G.Wellsandpublishedin1895forthefirsttime.Itwasadaptedintoatleasttwofeaturefilmsofthesamenameaswellastwotelevisionversionsandalargenumberofcomicbookadaptations.Itisgenerallycreditedwiththepopularizationoftheconceptoftimetravelusingavehiclethatallowsanoperatortotravelpurposefullyandselectively.ThetermtimemachinecoinedbyWellsisnowuniversallyusedtorefertoavehicletransportingpeopleintothefarfuture. Butcouldtimetravelactuallybepossible?Somescientistssayyesintheory.Theyproposeusingcracksintimeandspacecalledwormholeswhichcouldbeusedasshortcutstootherperiods.Einstein'stheoryofrelativityallowstimetravelinextremecircumstances.AndBritishphysicistStephenHawkingsaysyoucouldtravelintothefuturewithareallyfastspaceship﹣goingatnearlythespeedoflight.Thoughbuildingsuchaspaceshipwouldofcoursebenosimpletask. Evenifyoucouldtravelintothepastthereissomethingcalledthegrandfatherparadox.Itaskswhatwouldhappenifatimetravelerweretogobackintimeandhavehisowngrandfatherkilledforsomereasonandthereforepreventhimselffrombeingborn.Ifthetimetravelerwasn'tbornhowwouldhetravelbackintime? Andwouldyoureallyliketovisitthefuture?InH.G.Wells'bookthemaincharactertravelsintodistanttimewherehearrivesatabeachandisattackedbygiantcrabs.Hethenvoyages30millionyearsintothefuturewheretheonlylivingthingisablackobjectwithtentacles触角.Ifthat'swhat'sinstoremaybewearebetterjustlivinginthepresentdayafterall. 1ThenovelTheTimeMachinementionedinParagraph2aimstoshow. A.thespecialfeatureofthebook B.People'sinterestintimetravel C.thelonghistoryoftimetravel D.thecontributionofH.G.Wells 2Einstein'sandHawking'stheories. A.suggestthepossibilitytoinventthetimemachine B.havesimilaritiesinmanyways C.haveprovedwrongbysometimetravelers D.pushtheinventionofthefirstspaceship 3InParagraph4grandfatherparadoxprobablyreferstotheideathat. A.thetravelerispreventedfrommeetinghisgrandfather B.thetravelergoesbackintimetoseekforhisgrandfather C.thegrandfather'sdeathmakesthetraveler'sbirthimpossible D.Thereunionofthetravelerandhisgrandfatherbringshappiness 4Accordingtothepassagewhatisprobablytheauthor'sattitudetowardstimetravel? A.Supportive. B.Unconcerned. C.Unclear. D.Skeptical.
I'vereadlotsofstoriesaboutfamilymemories.Inthose1.I'vefoundvoiceofsadnessandlonging.It'struethatsomuchinourdailylivesmakesus2allthetime.Wefindourselveswithlessandtimetospendwithour3andfriends.I'vehadthesame4myself. Iusedtohave5timeswithmygrandfatherwhenwelivedtogether.WhenIwasveryyoungIoftenenjoyedspendingtimeinhis6watchingtheflowersandwateringthefruittrees.ButasIgrewupI7becameselfish. OncewhenIwas6wewentshoppingtogether.Aswetookthewrongbusandendedupgetting8unabletofindourwayback.Icouldn'tstay9andshoutedrudelyinhisface.Iwassostubborn固执的thatIwouldn'tstaysorry10returninghomethinkingIhaddonenothingwrong. NowI11howridiculous可笑的Iwasatthetime!AndIalsorealizehow12itwaswhenIfinallyadmittedIwas13!WhenItrulywantedtoexpressmy14mygrandfatherhadleftus15leavingmewithnomorechanceto16mymistake.Icouldn't17saytohimthethreewords﹣﹣﹣﹣Iamsorry. Wearespendingmoreandmoretimeoutsidewithlessandlesstimeto18withourfamiliesathome.So19themostofeverysecondyouhavewithyourlovedonesbecausetime20goingwaitingfornoone. 1A.books B.stories C.reports D.films 2A.crazy B.easy C.busy D.angry 3A.families B.classmates C.colleagues D.employers 4A.adventure B.research C.exploration D.experience 5A.good B.hard C.sad D.urgent 6A.kitchen B.garage C.house D.garden 7A.frequently B.rarely C.gradually D.finally 8A.bored B.lost C.hurt D.upset 9A.calm B.awake C.firm D.happy 10A.while B.unless C.until D.after 11A.learn B.imagine C.realize D.agree 12A.early B.late C.nice D.guilty 13A.serious B.nervous C.wrong D.painful 14A.concern B.worry C.opinion D.regret 15A.forever B.somehow C.alone D.instead 16A.careabout B.apologizefor C.thinkof D.referto 17A.again B.often C.even D.still 18A.spare B.save C.take D.kill 19A.follow B.receive C.divide D.make 20A.needs B.keeps C.misses D.stops
Alexis17satquietlyinthepassengerseatofherdad'scar.Shelethereyeslazilyscanthelandscapeforwildlife.Thenadeercameintoviewabout200yardsinfrontofthem.Dadthere'sadeerthere!Alexissaid.Itwasamaledeerwithsharpantlers角oneachsideofitshead. AsthecarmovedcloserAlexissawthatthedeer'sheadwasbenttowardtheground.Thensheheardascreamandsawanarmflyupnearthedeer'shead.Alexisrealizedthedeerwasattackingawoman.Suea44﹣year﹣oldmotherhadbeenoutforhermorningrun.Thedeerfollowedherandedgedcloser.IknewIwasintroubleSuesays.Shewenttopickupastickforself﹣defenseandthedeercharged.Itliftedherwithitsantlersandthrewherintotheair.Suecouldfeelbloodflewdownherleg.Withinsecondsthedeerhadpushedherofftheroad. WhenAlexisandherfatherpulledupthedeerwasthrowingSuelikeadoll.Alexislookedintothewoman'sterrifiedeyesandbeforeherfatherhadevenstoppedthecartheteenagerjumpedquicklyoutofthecarandrantowardthedeer.Iwaskickingittogetitsattentionshesays.Thenherfatherwhohadfollowedhisdaughterpushedthedeerawayfromthewomen. AlexishelpedSueintothecarandthenappliedapieceofclothtoSue'sinjuredleg.We'regoingtogetyoutoahospitalAlexissaid.Thensheheardherfathershoutloudly.Hehadbeenknockedtotheground.Alexistookholdofahammerfromthecarandrantowhereherfatherlayonhisback.Shebeatthedeer'sheadandneckbuttheblowsdidn'tscareitaway.Iwaslosingfaithshesays.AcouplemorestrikesAlexissaidherfather.Youcandoit.TurningthehammeraroundAlexisclosedhereyesandbeatthedeer'sneckwithallherstrength.Whensheopenedhereyesthedeerwasrunningaway.Alexisgotinthedriver'sseatandspedtowardthenearesthospital. AfterSuewastreatedshetearfullythankedherrescuers.Youexpectateenagegirltogetonthephoneandcallforhelpshesaysnottobeatupadeer. 1WhatwasSuedoingwhenshewasattackedbythedeer? A.Shewasdrivinghome. B.Shewasrestingontheroad. C.Shewastakingexercise. D.Shewasfeedingwildanimals. 2WhatdidAlexisdotosaveSue? A.Shepushedthedeeraway. B.Shehitthedeerwithherfeet C.Shedrovethecartohitthedeer. D.Shebeatthedeerwithahammer. 3WhichofthefollowingwordscanbestdescribeAlexis? A.Strong. B.Cruel. C.Energetic. D.Brave. 4Whatisthebesttitleforthepassage? A.AWomanWasSeriouslyInjured B.ADangerousDeerAttackedaWoman C.AGirlRescuedHerFatherSuccessfully D.ATeenagerSavedOthersfromaDeerAttack
在购买和使用化肥时要了解化肥的性质以便合理使用．为了给农民做技术指导大海同学利用自己掌握的知识对碳酸钾硫酸铵两种化肥的相关性质做了一下探究请将下列实验报告填写完整． 【实验记录与分析】 【结论与应用】碳酸钾和硫酸铵不能混合使用原因是碳酸钾溶液呈碱性与硫酸铵混合施用产生NH3降低肥效． 【知识拓展】鉴别失去标签的碳酸钾和硫酸铵固体请你用两种不同类别的试剂一次性鉴别它们．请写出所用的试剂．
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